Angular CLI 新建Bootstrap项目报Bootstrap dropdown require Popper.js错误

问题

基于Angular cli新建bootstrap项目，angular-cli.json的script配置如下：

"scripts": [
  "../node_modules/jquery/dist/jquery.slim.min.js",
  "../node_modules/bootstrap/dist/js/bootstrap.min.js",
  "../node_modules/popper.js/dist/umd/popper.min.js"
]

Chrome control报错：

Uncaught Error: Bootstrap dropdown require Popper.js (https://popper.js.org)
    at eval (eval at webpackJsonp.../../../../script-loader/addScript.js.module.exports (addScript.js:9), :6:17548)
    at eval (eval at webpackJsonp.../../../../script-loader/addScript.js.module.exports (addScript.js:9), :6:23163)
    at eval (eval at webpackJsonp.../../../../script-loader/addScript.js.module.exports (addScript.js:9), :6:50902)
    at eval ()
    at webpackJsonp.../../../../script-loader/addScript.js.module.exports (addScript.js:9)
    at Object.../../../../script-loader/index.js!../../../../bootstrap/dist/js/bootstrap.min.js (bootstrap.min.js?f885:1)
    at __webpack_require__ (bootstrap a2f1d85ef068872b0530:54)
    at Object.2 (scripts.bundle.js:66)
    at __webpack_require__ (bootstrap a2f1d85ef068872b0530:54)
    at webpackJsonpCallback (bootstrap a2f1d85ef068872b0530:25)

解决方案

在angular-cli.json的script里，需要把popper.min.js放在bootstrap.min.js之前。